Fixing syntax error in makefile

Fixing syntax issue in Makefile.power added by recent commit
af19cda65a

Makefile.power

@@ -12,7 +12,7 @@ endif
 ifeq ($(CORE), POWER10)
 ifneq ($(C_COMPILER), PGI)
 CCOMMON_OPT += -Ofast -mcpu=power10 -mtune=power10 -mvsx -fno-fast-math
-ifeq ($(F_COMPILER, IBM)
+ifeq ($(F_COMPILER), IBM)
 FCOMMON_OPT += -O2 -qrecur -qnosave
 else
 FCOMMON_OPT += -O2 -frecursive -mcpu=power10 -mtune=power10  -fno-fast-math