tests: lib: c_lib: fix double promotion error

Fix double promotion warnings

Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>

tests/lib/c_lib/common/src/test_sqrt.c

@@ -13,11 +13,11 @@
 #define local_abs(x) (((x) < 0) ? -(x) : (x))
 
 #ifndef NAN
-#define NAN	(__builtin_nansf(""))
+#define NAN	(__builtin_nans(""))
 #endif
 
 #ifndef NANF
-#define NANF	(__builtin_nans(""))
+#define NANF	(__builtin_nansf(""))
 #endif
 
 #ifndef INF
@@ -91,14 +91,13 @@ static int isnanf(float x)
 #endif
 
 /* small errors are expected, computed as percentage error */
-#define MAX_FLOAT_ERROR_PERCENT		(3.5e-5)
+#define MAX_FLOAT_ERROR_PERCENT		(3.5e-5f)
 #define MAX_DOUBLE_ERROR_PERCENT	(4.5e-14)
 
 ZTEST(libc_common, test_sqrtf)
 {
 int i;
-float	exponent, resf, square, root_squared;
-double	error;
+float	exponent, resf, square, root_squared, error;
 uint32_t max_error;
 int32_t ierror;
 int32_t *p_square = (int32_t *)&square;
@@ -129,7 +128,7 @@ int32_t *p_root_squared = (int32_t *)&root_squared;
 			if ((resf > 0.0f) && (resf < INFF)) {
 				error = (square - root_squared) /
 					square * 100;
-				if (error < 0.0) {
+				if (error < 0.0f) {
 					error = -error;
 				}
 				/* square and root_squared should be almost identical
@@ -143,7 +142,7 @@ int32_t *p_root_squared = (int32_t *)&root_squared;
 				}
 			} else {
 				/* negative, +NaN, -NaN, inf or -inf */
-				error = 0.0;
+				error = 0.0f;
 			}
 			zassert_true(error < MAX_FLOAT_ERROR_PERCENT,
 					"max sqrtf error exceeded");